EP0487483B1 - Method and device for dewatering of a paper web by pressing - Google Patents
Method and device for dewatering of a paper web by pressing Download PDFInfo
- Publication number
- EP0487483B1 EP0487483B1 EP91850291A EP91850291A EP0487483B1 EP 0487483 B1 EP0487483 B1 EP 0487483B1 EP 91850291 A EP91850291 A EP 91850291A EP 91850291 A EP91850291 A EP 91850291A EP 0487483 B1 EP0487483 B1 EP 0487483B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- web
- fabric
- nip
- roll
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0209—Wet presses with extended press nip
- D21F3/0218—Shoe presses
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/04—Arrangements thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/04—Arrangements thereof
- D21F3/045—Arrangements thereof including at least one extended press nip
Abstract
Description
Claims (18)
- Method for dewatering a paper or board web (W) in a paper machine, the paper web (W) having been drained in the former of the paper machine, wherein the dewatering is effected by passing the paper web (W) on water receiving fabrics (20,30,40,50) through a press section having at least two subsequent dewatering press nips (NP1, N2) so that, by the effect of the compression pressure, water is transferred out of the fibre mesh of the paper web (W) into the spaces in said fabrics as well as into the spaces in hollow faces of mibile dewatering members, such as press rolls (35, 145, 155), that apply pressure to the web (W), the paper web being subsequently transferred to the drying section of the paper machine, wherein the paper web (W) is transferred from the pick-up point (P) on the forming wire (10) of the former to the transfer point (S) to the drying wire (80) of the drying section in a closed draw, being constantly supported by a water receving fabric (20, 30, 40, 50) a transfer fabric or any other corresponding transfer surface, at least one of said two subsequent press nips being an extended press nip (NP1), the length of which extended press nip in the machine direction being larger than about 100 mm,
characterized inthat a draining pressing is carried out on the web (W) forming wire (10) in a pre-pressing zone (No, NHo, NPo) preceding said pick-up point (P), in which a relatively open water receiving fabric (19,19B) is placed against the forming wire (10),that the extended press nip (NP1) is formed by a hose roll (200) or a band roll (300) and an opposite press roll (35),that the distribution of the compression pressure employed within said extended press nip (NP1) is regulated and/or selected both in the transverse direction of the web (W) and in the machine direction so as to set or to control the different profiles of properties of the web, andthat said transfer from the forming wire (10) to the drying wire (80) is carried out at a speed that is higher than about 25-30 m/s. - Method as claimed in claim 1, characterized in that, in said pre-pressing zone, the relatively open press fabric (19) and the forming wire (10) are passed through a roll nip (No) optionally together with another, opposite press fabric (19A).
- Method as claimed in claim 1, characterized in that, in said pre-pressing zone, the relatively open press fabric (19B) and the forming wire (10) are passed through a belt-tensioned nip (NHo), in which the compression pressure is preferably in the range of 0,01-0.5 MPa and whose length is preferably in the range of 100-500 mm.
- Method as claimed in claim 1, characterized in that, in said pre-pressing zone, the relatively open press fabric (19) and the forming wire (10) are passed through an extended nip (NPo) in which a compression pressure of preferably 0,5-3 MPa is employed and whose length is preferably in the range of 100-300 mm.
- Method as claimed in any of the claims 1-4,
characterized inthat the paper web is transferred at the pick-up point (P) onto the lower face of a first upper water receiving fabrics (20) which is passed through the first press nip (NP1) in the press section together with a first lower fabric (30),that on the upper face of the first lower fabric (30) the web (W) is transferred to a suction roll (41) at which the web is transferred onto the lower face of second upper fabric (40),that the web is passed passed through the second, susequent press nip (N2) in the press section between the second upper fabric and a second lower receiving fabric (50), andthat the web is transferred on support of the second lower fabric to said transfer point (S) on the drying wire (80),both press nips preferably being extended press nips. - Method ad claimed in any of the claims 1-4, characterized in that the paper web is transferred at the pick-up point onto the lower face of a first water receiving fabric which is passed through the first press nip in the press section together with a first lower fabric,that on the upper face of the first lower fabric the web is transferred to a suction roll, at which the web is transferred onto the lower face of a second upper fabric,that the web is passed through a second press nip in the press section between the second upper fabric and a second lower water receiving fabric on whose support the web is transferred onto a third upper fabric,that the web is passed through a third press nip, preferably a roll nip, between the third upper fabric and a third lower fabric, andthat the web is transferred on support of the third lower fabric to the transfer point on the drying wire.
- Method as claimed in any of the claims 1-6, characterized in that the maximum compression pressure used in the extended press nip is adjusted to the range pmax = 3-9 MPa, preferably pmax = 5-8 MPa, and that the distribution of pressure is fitted preferably such that in the initial part of the extended press nip the compression pressure is increased steeply, whereupon the compression pressure is kept substantially invariable, and in the rear end of the extended press nip the compression pressure is regulated such that it is higher than said invariable compression pressure.
- Method as claimed in any of the claims 1-7, characterized in that the dewatering pressing of the web (W) is started when the dry solids content ko of the web (W) is = 10%, and water is removed out of the web so that after the press section its dry solids content is kout = 35...65%, preferably kout = 40...55%.
- Method as claimed in any of the claims 1-8, characterized in that the web (W) is guided through the different pressing stages in the press section as a substantially straight run, such that the angle (a) of change in the direction of the web (W) as the web moves through the press nips and from one fabric onto the other is a < 30°, preferably a ≈15°.
- Paper making machine, in which a paper web (W) to be dewatered by pressing is passed from a former section to a press section and subsequently into a drying section, which press section comprises at least two subsequent press nip zones (NP1,N2), two water receiving press fabrics (20, 30) passing through at least the first one (NP1) of said press nip zones with the web (W) therebetween, the press-section comprising:press and transfer fabrics (20, 30, 40, 50) fitted in such a way that the paper web (W) to be dewatered has a closed draw from the pick-up point (P) on the forming wire (10) of the forming section to the transfer point (S) to the drying section, without free, unsupported draws, the web being constantly supported between said pick-up point (P) and said transfer (S) by a press fabric (20, 30, 40, 50), a transfer fabric or any other corresponding transfer surface,an arrangement of press fabrics (20, 30, 40, 50) and press rolls (25,35,145,155), which forms said at least two subsequent press nip zones,at least one of said two subsequent press nip zones being an extended press nip zone (NP1), the length of which extended press nip zone (NP1) in the machine direction being larger than 100 mm,that the extended press nip zone (NP1) is formed by a hose roll (200) or a band roll (300) and an opposite press roll (35), andthat a pre-pressing zone preceding said pick-up point (P) is formed by passing the forming wire (10) and an opposite. open press fabric (19, 19B) with the web (W) therebetween through a press nip (No, NPo, NHo).
- Paper making machine as claimed in claim 10, characterized in that the press nip (No) of the pre-pressing zone is formed by a suction roll (16) and a hollow-faced roll (15).
- Paper making machine as claimed in claim 10, characterized in that the press nip of the pre-pressing zone is an extended nip (NPo).
- Paper making machine as claimed in claim 12, characterized in that said extended nip (NPo) is formed by a suction roll (16) and a hose roll (15A) provided with a hollow-faced slide belt mantle (201).
- Paper making machine as claimed in claim 10, characterized in that the press nip (NHo) of the pre-pressing zone is formed by a suction roll (16) and a tensioned belt (19C).
- Paper making machine as claimed in any of the claims 10 to 12, characterized inthat the first press nip zone (NP1) in the press section ccmprises a first upper pick-up and press fabric (20) and a first lower press fabric (20),that the second press nip zone in the press section comprises a second upper press fabric (40),that a suction roll (41) is arranged between the two subsequent press nip zones for transferring the web (W) from the first lower fabric (30) to the second upper fabric (40),that the second press nip zone (N2) in the press section comprises a second lower press fabric (50), andthat both press nip zones preferably are extended press nip zones.
- Paper making machine as claimed in any of the claims 10 to 12, characterized in that the press section comprises three subsequent press nip zones, of which is at least one is an extended press nip zone and the others are provided by roll nips.
- Paper making machine as claimed in any of the claims 10 to 16, characterized in that the extended press nip zone (NP1) is formed in connection with a hose roll (200) which comprises a thin, elastic hose of substantially circular section, to which hose (201) closed ends (202a, 202b) are fixed permanently, said roll (200) being provided with a stationary inner frame (205), to which an adjustable glide shoe (210) is attached, which is loaded in a controlled way by hydraulic loading members, preferably hydraulic loading members (206, 207) placed in two separate rows, so that the compression pressure in the extended press nip zone can be controlled both in the machine direction and in the transverse direction.
- Paper making machine as claimed in any of the claims 10 to 16, characterized in that said opposite press roll (160) in the extended press nip zone is preferably an adjustable-crown press roll, and that the extended press nip zone is formed in connection with a band roll (300) which is provided by a flexible band loop (301), a glide shoe (310) that forms the nip zone being placed inside the loop (301), said band loop (310) being guided by a leading roll (311) or an equivalent guide member provided in the band loop from the opposite side of the glide shoe (310), whereby in view of prevention of oil splashes, both ends of said band loop are closed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96120948A EP0770727B1 (en) | 1990-11-23 | 1991-11-22 | Method and device for dewatering of a paper web by pressing |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI905798A FI96789C (en) | 1990-11-23 | 1990-11-23 | Method and apparatus for dewatering a paper web by pressing |
FI905798 | 1990-11-23 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96120948A Division EP0770727B1 (en) | 1990-11-23 | 1991-11-22 | Method and device for dewatering of a paper web by pressing |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0487483A1 EP0487483A1 (en) | 1992-05-27 |
EP0487483B1 true EP0487483B1 (en) | 1998-07-15 |
Family
ID=8531454
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96120948A Expired - Lifetime EP0770727B1 (en) | 1990-11-23 | 1991-11-22 | Method and device for dewatering of a paper web by pressing |
EP91850291A Expired - Lifetime EP0487483B1 (en) | 1990-11-23 | 1991-11-22 | Method and device for dewatering of a paper web by pressing |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96120948A Expired - Lifetime EP0770727B1 (en) | 1990-11-23 | 1991-11-22 | Method and device for dewatering of a paper web by pressing |
Country Status (5)
Country | Link |
---|---|
EP (2) | EP0770727B1 (en) |
AT (2) | ATE168423T1 (en) |
CA (1) | CA2055927C (en) |
DE (2) | DE69129788T2 (en) |
FI (1) | FI96789C (en) |
Families Citing this family (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI98844C (en) * | 1991-12-23 | 1997-08-25 | Valmet Paper Machinery Inc | Press section in paper machine, especially for printing paper grades |
US5639351A (en) | 1991-12-23 | 1997-06-17 | Valmet Corporation | Press section of a paper machine, in particular for printing paper qualities |
EP0598991B1 (en) * | 1992-11-24 | 1996-01-17 | J.M. Voith GmbH | Press section for a paper machine |
FI93237C (en) * | 1993-06-11 | 1995-03-10 | Valmet Tampella Inc | Method and apparatus in a paper or cardboard machine for dewatering the web |
FI112391B (en) * | 1993-12-08 | 2003-11-28 | Metso Paper Inc | Paper machine press section using a long nip press |
US6368466B1 (en) * | 1993-12-08 | 2002-04-09 | Valmet Corporation | Press section of a paper making machine employing an extended nip press |
US5868904A (en) * | 1993-12-08 | 1999-02-09 | Valmet Corporation | Press section employing an extended nip press with suction counter roll |
US5876565A (en) * | 1994-10-06 | 1999-03-02 | Valmet Corporation | Press section with an equalizing nip for compensating for elongation of a paper web |
FI95610C (en) * | 1994-10-06 | 1996-02-26 | Valmet Paper Machinery Inc | Press section of a paper machine equipped with a compensating press |
FI114227B (en) * | 1995-04-24 | 2004-09-15 | Metso Paper Inc | Paper machine with press section and dryer section |
DE19535343A1 (en) * | 1995-09-25 | 1997-03-27 | Voith Sulzer Papiermasch Gmbh | Method and machine for producing fibrous webs |
DE19609988A1 (en) * | 1996-03-14 | 1997-09-18 | Voith Sulzer Papiermasch Gmbh | Press section of a paper machine |
DE19702574A1 (en) * | 1997-01-24 | 1998-07-30 | Voith Sulzer Papiermasch Gmbh | Press arrangement |
DE19705360A1 (en) | 1997-02-12 | 1998-08-13 | Voith Sulzer Papiermasch Gmbh | Press device for dewatering or smoothing a fibrous web |
DE19708967A1 (en) * | 1997-03-05 | 1998-09-10 | Voith Sulzer Papiermasch Gmbh | Papermaking machine press section |
DE19801891A1 (en) | 1998-01-20 | 1999-07-22 | Voith Sulzer Papiertech Patent | Press section |
DE19802054A1 (en) * | 1998-01-21 | 1999-07-22 | Voith Sulzer Papiertech Patent | Press section |
FI115649B (en) | 1998-06-10 | 2005-06-15 | Metso Paper Inc | Method of making paper and paper machine |
WO2000070142A1 (en) * | 1999-05-14 | 2000-11-23 | Metso Paper, Inc. | Method and machine for manufacturing printing paper or paperboard |
US6730192B1 (en) | 1999-05-14 | 2004-05-04 | Metso Paper, Inc. | Method and machine for manufacturing printing paper or paperboard |
DE19934875A1 (en) * | 1999-07-24 | 2001-01-25 | Voith Paper Patent Gmbh | Paper machine |
DE19938979A1 (en) * | 1999-08-19 | 2001-02-22 | Voith Paper Patent Gmbh | Press section |
CA2383863C (en) * | 1999-09-06 | 2007-01-30 | Metso Paper Karlstad Ab | Board machine and method of manufacturing a multilayer cardboard web |
EP1342839B1 (en) | 2002-03-01 | 2006-11-22 | Voith Patent GmbH | Method and apparatus for measuring the hardness or compactness of a clothing |
DE10233924A1 (en) * | 2002-07-25 | 2004-02-12 | Voith Paper Patent Gmbh | Papermaking process automatically monitors and corrects water drainage local distribution pattern within dewatering nip zone |
DE60316971T2 (en) * | 2002-09-09 | 2008-11-13 | Metso Paper, Inc. | METHOD FOR THE PRODUCTION OF PAPER AND MACHINE FOR THE MANUFACTURE OF PAPER |
FI116400B (en) * | 2002-11-19 | 2005-11-15 | Metso Paper Inc | Press section in a paper or cardboard machine |
DE10332906A1 (en) * | 2003-07-19 | 2005-02-17 | Voith Paper Patent Gmbh | Press section to extract water from a wet web, in a machine for the production of paper/cardboard/tissue, has an extended roller press gap for the web and absorbent blankets with conditioning press rollers for the continuous blankets |
DE10343215A1 (en) * | 2003-09-18 | 2005-04-14 | Voith Paper Patent Gmbh | Roller with internal pressure shoe for papermaking or finishing, passes flexible roller casing between shoe and pressing component, guiding its edges against stationary end discs |
JP2006257602A (en) * | 2005-03-18 | 2006-09-28 | Ichikawa Co Ltd | Papermaking machine and method for recovery of papermaking/conveyer belt of papermaking machine |
DE102007035548A1 (en) * | 2007-07-28 | 2009-01-29 | Voith Patent Gmbh | Press arrangement |
SE539535C2 (en) * | 2013-11-07 | 2017-10-10 | Stora Enso Oyj | Process for dewatering a suspension comprising microfibrillated cellulose |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI81854C (en) * | 1982-09-15 | 1990-12-10 | Valmet Oy | PRESS SPRING WITH PRESS SHEET I EN PAPER MACHINERY. |
US4483745A (en) * | 1982-09-29 | 1984-11-20 | Beloit Corporation | Method and apparatus of sheet transfer using a nonporous smooth surfaced belt |
FI66932C (en) * | 1983-01-10 | 1984-12-10 | Valmet Oy | ARRANGEMANG VID LAONGNYPSPRESS |
DE3311998A1 (en) * | 1983-04-02 | 1984-10-04 | J.M. Voith Gmbh, 7920 Heidenheim | Belt press unit, preferably as a wet press of a paper machine |
DE3328162C2 (en) | 1983-08-04 | 1986-02-20 | J.M. Voith Gmbh, 7920 Heidenheim | Paper machine |
US4561939A (en) | 1984-03-26 | 1985-12-31 | Beloit Corporation | Extended nip press arrangement |
FI842115A (en) * | 1984-05-25 | 1985-11-26 | Valmet Oy | PRESS SPEAKER PRESS NYP I EN PAPPERSMASKIN. |
FI842114A (en) * | 1984-05-25 | 1985-11-26 | Valmet Oy | PRESSPARTI MED SEPARATA PRESSZON I EN PAPPERSMASKIN. |
FI82500C (en) * | 1985-02-18 | 1991-03-11 | Valmet Oy | Press section with separate press nip in a paper machine |
EP0309530B1 (en) * | 1987-04-14 | 1991-10-16 | J.M. Voith GmbH | Machine for manufacture of webs of fibrous materials |
DE3742848C3 (en) * | 1987-12-17 | 1996-06-13 | Escher Wyss Gmbh | Press section of a paper machine |
DE3815278A1 (en) * | 1988-05-05 | 1989-11-16 | Voith Gmbh J M | PRESS RELEASE OF A MACHINE FOR THE PRODUCTION OF A FIBROUS MATERIAL SHEET, IN PARTICULAR PAPER SHEET |
SE461171C (en) * | 1988-05-25 | 1992-05-15 | Valmet Paper Machinery Inc | LONG NYP PRESSES BEFORE PAPER OR CARTON MACHINERY |
SE461154B (en) * | 1988-05-25 | 1990-01-15 | Valmet Paper Machinery Inc | LONG NYP PRESSES BEFORE PAPER OR CARTON MACHINERY |
FI82092C (en) * | 1989-03-22 | 1991-01-10 | Valmet Paper Machinery Inc | long nip press |
AU6274690A (en) * | 1989-11-27 | 1991-06-26 | Beloit Corporation | A press section apparatus |
-
1990
- 1990-11-23 FI FI905798A patent/FI96789C/en active IP Right Grant
-
1991
- 1991-11-20 CA CA002055927A patent/CA2055927C/en not_active Expired - Fee Related
- 1991-11-22 AT AT91850291T patent/ATE168423T1/en not_active IP Right Cessation
- 1991-11-22 EP EP96120948A patent/EP0770727B1/en not_active Expired - Lifetime
- 1991-11-22 DE DE69129788T patent/DE69129788T2/en not_active Expired - Fee Related
- 1991-11-22 EP EP91850291A patent/EP0487483B1/en not_active Expired - Lifetime
- 1991-11-22 AT AT96120948T patent/ATE218648T1/en not_active IP Right Cessation
- 1991-11-22 DE DE69133030T patent/DE69133030T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
FI905798A (en) | 1992-05-24 |
DE69133030D1 (en) | 2002-07-11 |
CA2055927A1 (en) | 1992-05-24 |
FI905798A0 (en) | 1990-11-23 |
FI96789B (en) | 1996-05-15 |
DE69133030T2 (en) | 2002-11-21 |
FI96789C (en) | 1996-08-26 |
DE69129788T2 (en) | 1998-11-19 |
CA2055927C (en) | 1999-02-02 |
EP0770727A1 (en) | 1997-05-02 |
ATE168423T1 (en) | 1998-08-15 |
EP0770727B1 (en) | 2002-06-05 |
EP0487483A1 (en) | 1992-05-27 |
DE69129788D1 (en) | 1998-08-20 |
ATE218648T1 (en) | 2002-06-15 |
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